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KEAM 2019 Math Paper
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© examsnet.com
Question : 5
Total: 121
If
A
B
=
A
and
B
A
=
B
, then
A
2
,
B
2
is equal to
−
A
,
−
B
2
A
,
B
A
2
,
B
−
A
,
B
A
,
B
Validate
Solution:
Given,
A
B
=
A
and
B
A
=
B
,
S
o
,
A
B
A
=
A
2
A
(
B
A
)
=
A
2
A
⋅
B
=
A
2
or
A
=
A
2
Also
B
A
=
B
B
A
B
=
B
2
B
A
=
B
2
or
B
=
B
2
© examsnet.com
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